What does this LOINC code represent?

This LOINC code identifies a lab observation, measurement, question, or clinical concept in a standardized format.

Is this enough to understand my test result?

No. The code identifies the test or observation, but the interpretation depends on the actual result, reference range, and clinical context.

LOINCActiveBoth

LOINC Code 1558-6: Glucose post fast [Mass/Vol]

Name: LOINC Code 1558-6: Glucose post fast [Mass/Vol]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T11:17:25.873Z

1558-6 is a LOINC code used to identify Glucose post fast [Mass/Vol] in laboratory and clinical observation data. You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges. LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Glucose^post CFst. It is commonly used with the system or sample type Ser/Plas.

Reviewed by HealthAssure Clinical TeamUpdated 21 May 2026

What is this code?

LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Glucose^post CFst. It is commonly used with the system or sample type Ser/Plas.

When is it used?

Used in lab systems, EHRs, and clinical data exchange.
May identify a test, observation, survey item, or clinical document request rather than a diagnosis.
Status: ACTIVE
Order vs observation: Both

What it does not mean

The code identifies the observation or test, not the actual result.

Key facts

Fasting glucose [Mass/volume] in Serum or Plasma
Glucose^post CFst
After; Calorie Fast; CHEMISTRY.CHALLENGE TESTING; Endocrine; Endocrinology; Fast; Fasting; Glu; Glu tol; Gluc; Glucose tolerance; Glucoseur; GTT; Level; Mass concentration; p fast; PC; Pl; Plasma; Plsm; Point in time; PST; QNT; Quan; Quant; Quantitative; Random; SerP; SerPl; SerPlas; Serum; Serum or plasma; SR; UniversalLabOrders

Where you may see this code

You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges.

Common synonyms

Glucose post fast [Mass/Vol]Fasting glucose [Mass/volume] in Serum or PlasmaGlucose p fast SerPl-mCncGlucose^post CFstCHAL.ROUTINEGlucose after Fast, BloodMCnc

Frequently asked questions

Code details

Code1558-6

SystemLOINC

Display nameGlucose post fast [Mass/Vol]

DescriptionGlucose^post CFst

Short nameGlucose p fast SerPl-mCnc

ComponentGlucose^post CFst

PropertyMCnc

TimingPt

System (specimen)Ser/Plas

ScaleQn

ClassCHAL.ROUTINE

Example unitsmg/dL

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0

Last changed2.73

Consumer names

Glucose after Fast, Blood

Part names

Glucose^post CFstMCncPtSer/PlasQnMass ConcentrationPoint in time (spot)Serum or Plasma

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from LOINC. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.